Attachment for rulers



Jan. 7, 1936. M. L. ARONSON ATTACHMENT FOR RULERS' Filed Jan. 19, 1934 UNITED STATES PATENT OFFICE 2,026,768 ATTACHMENT roa RULERS Meyer L. Aronson,' Hartford, Coma, assignor of one-hall to William Zachs, Hartford, Conn.

I Application January 19, 1934, Serial No.'70'1,34 2

claims. (01. 33-27) My invention relates to devices arranged for attachment to rulers whereby circles maybe drawn by the useof such ruler and attachment.

and the graduations on the ruler may be made I use of to determine the radius or diameter of the circle.

One form of an attachment embodying my invention, and in the construction and use of which the objects herein setout, as well as others, may be attained is illustrated in the accompanying drawing, in which- Figure 1 is a face view of a ruler with my improved attachment placed thereon.

Figure 2 is an edge view of the same.

Figure 3 is an end view. Figure 4 is an isometric view of the attachment.

Figure 5 is an isometric view illustrating a manner of use of the attachment.

Figure 6 is a view of a fragment of a ruler illustrating a modification of the device.

In the accompanying drawing the numeral I denotes a ruler that may be of any approved form having parallel opposite edges and provided with such markings may be desired.

through the ruler near one or graduations 8 as A pivot hole 9 extending edge is provided for the reception of a pin ID or other suitable point- -ed instrument to serve as an axis on which the ruler may be rotated.

. My improved attachment, comprises a band which is wrapped about the ruler and is made to slidably fit thereon of. This band has lips il-l2 overlapping the ruler onone face andpreferablycloselyapproaching each other; The lip I I has a pencil point receiver IS in the form of a hole extending through an ear l4 projecting from the back of the lip II.

In a manner of lengthwise along opposite a graduation which for movement endwise thereuse the attachment is 'slid the ruler until the hole It is will indicate a distance from the hole 9 which it is desired the radius of a circle to be obtained shall have. 'A pin -a pencil IS the hole 9 and the point of tating the ruler on the axis of the pin 9 a circle I6 is obtained.

It is appreciated that in the form of the structure shown in Figs. 1-4 the graduations will not accurately denote the radiusof the circle to be produced, but it will be close enough to serve all practical purposes for finer results are desired, the ruler I! may be providedwith an'ear II, as shown designed. If, however,

which the instrument is in Fig. 6, said ear having a hole l9 formed therein which will be sul'istantially a distance from the line of the edge of the ruler as that at which the hole I3 in the ear I4 is located. With this form of the device the radius of the circle to be 5 drawn may be more closely fixed by use of the graduations 8 on the ruler.

In order that a pencil may be conveniently had for use with the ruler, the lip I l is curved backwardly upon itself, thereby forming a spring clip 10 of a size suitable to receive the pencill5, and as shown in Fig. 1 of the drawing.

The ruler is preferablymade of such size tha it may be carried in the pocket of a garment, and when thus carried the pencil will be conveniently l5 accessible for any use that may be desired.

In order to retain the pencil and the ruler from accidental removal from the pocket, the lip [2 has a holding finger 2| extended therefrom with a knob 22 at its outer end. This finger is posi- 20' tioned close enough to theruler, when the attachment is aflixed thereto, to exert a frictional grasp upon the outer wall of the pocket so that a little force will be required to remove the attachment and the ruler with the pencil there- 25 on from the pocket.

I claim- 1. Aruler attachment comprising a band having a main portion engaging one side of the ruler and fitted for sliding movement lengthwise along the ruler by means of ends backturned fro said main portionto receive the opposite edg s and the opposite side of said ruler, said attachment having an ear at the bend of one of said backturned ends with a hole for the reception of the point of a pencil wherewith to transcribe a circle in connection with another hole in the ruler to establish the center of said circle.

2. A ruler attachment comprising a band fitted for sliding movement lengthwise along the ruler,

. edges and the opposite side of saidruler, said band having a hole for the reception of the point of a pencil.

4. A ruler having a hole formed therein near 56 one edge and an attachment comprising a main portion engaging one side of the ruler and fitted for sliding movement lengthwise along the ruler by means of ends backturned from said main portion to receive the opposite edges and the on posite side of said ruler, said-i attachment also having a hole for the reception of the point of pencil therein.

5. A ruler having an ear with a hole therein substantially in line with the edge of the ruler and an attachment comprising a band having a main portion engaging one side of the ruler and fitted for sliding movement lengthwise along the ruler by means of ends backturned from said main portion to receive the opposite edges and the opposite, side of the ruler and also having a hole for the reception of the point of a pencil substantially in the same distance from the edge of the ruler as that at which the hole-in the ruler is located.

MEYER L. ARONSON. 

